Portable type Gas Detector is a battery powered instrument to monitor the concentration of up to five different gases together with levels of ambient temperature, atmospheric pressure and ventilation air velocity. The Gas Detector features programmable audio/visual alarms, an illuminated graphic display to show both active and historic sensor data, and a plug-in rechargeable battery pack that can be changed underground. The Gas Detector is intended for professional use where high accuracy is required with comprehensive data logging and trend display. The Portable type Gas Detector finds use in hazardous areas in mining and industrial applications.